Lens grinding and polishing machine



April 6,1926. 1,579,505

' J. T. BRESNIN I LENS GRINDING AND POLISHING MACHINE Filed March 5, 1925 3 Sheets-Sheet 1 April 6,1926. I

- J. T. BRESNIN LENS GRINDING AND POLISHING MACHINE Filed March 5, 1923 3 Sheets-Sheet 2 (WW I.

c7. .7. Brwzzka,

A ril 6,1926. 1,579,506

J. T. BRESNIN LENS GRINDING AND POLISHING MACHINE Filed March 5, 192-3 3 Sheets-Sheet 3 grwmtoc atknmq I Patented Apr, 6 19 i I f v- PATENT oF F ce.

I UNITED STATES JOHN T. BiiasNn oF LaNcAs'raa, 01110.

LENS emnnme AND Application filed March 5,

To all whom it may concern:

7 Be it known that IQJoI-i T. BREsNIiv, acitizen of the United States, residing at Lancaster, in the county of Fairfield and State of Ohio, have invented certain new and useful Improvements in Lens Grinding and Polishing-Machines, of'which the fol-' expense, the machine being constructed in such manner that the lenses may bereadily position after structed,

possbility of deran andquickly placed and held in position for grinding, and quickly removed from such the grinding orpolishing operation,- thereby eliminating the loss of time and the expense-incidentto grinding or polishingvmachines, as heretofore icon- Furthermore, I aim to provide a machine of the class described'whichiwill embrace the desired features of simplicity; efliciency and durability, which may beginstalled and maintainedatminimum expense, which will embody comparatively few parts, and these so 'arrangedand corelated as to reduce. the eme t to a minimum,

and wherein all of t e parts will be readily accessible so that repairs or replacements may be made quickly and inexpensively;

1 Another object of my invention is the rovision of a machine ofthe. type descr ed, wherein the lenses" may be ground or polished in multiples so that when the machine is operated at-full cap acity the polishing or. grinding of a plural ty oflenses will cost no more than the polishing or grinding of a sin lelens,

Y E still furtherobject of my invent on IS the rovision of a machine of the r character escribed ,whe'rebya plurality of lenses maybe held in proper relation to a spherical grinding element, so that all {of the lenses may be treated simultaneouslly. i I v With the 1' above recited, o jects view, and others ofaisiinilar nature, the invention de i fi l tiflfit z im mi romsnine MAOHINE- 1 ,1923. seriaimmaen. i o

arrangement of parts set forth inand falling Within the scope of the appended claims,

In the accompanying drawings:

Figure 1 is a view in side elevation of a lens grinding or. polishing nachineconstructed 1n,accordancewith my invention.

Figure 2 an enlargedfragmentary: verticalsectional view through one ofthe, inachines showingthe lens carriers and spherical polishing element.

Fi re '3 is a fragmentary top plan view showing the adjustment fora lens, carrier.

Figure 4 is a fragmentary, longitudinal sectional view through the spherical element showing thehemispheres of which the same is composed.

' Figure 5 is asectional view on the line i I 55 of Figure 2.

Figure 6 is a plan View of a three-armed lens carrier support;

Figure 7 is a similar view of a four-armed lens carrier support.

Figures 8 and 9 fi-I'Q-t detailed yiews of, the shift ng means for a lens carrier.

i Referring now't'o the drawings in detail, 1 designates abaseframe composedof suitable material and of anyv desired formation.

In the presentinstance Iarraiige at the'ends of 'the base. frame 1e. on the upper surface thereof transversely extending supporting blocks 2-'2.and fastened to these blocks 22 g and; upstanding-therefrom are supporting standards 3+3, respectively; appropriately fastened to the blocks'2r .On the upper ends of the. standards 3-3, r'espectively-, are supporting beams 4l-l." Thesebeams project 'outwardly beyond "the standards 3 and the go utwardly; projecting. ends are arranged in a horizontal plane, while the inner ends of the beams are inclined downwardly, as at 5; and connected to the lower ends of the in 7 r clinedportions 5L of the beams is a hanger 6 that carries abearing 7 .in which is iournaled a horizontal shaft 8. The ends of thegshaft 8 terminate slightly beyond the respective ends or." the bearings 7 i and are equipped respectively with-, clutch" collars 99. Adjacent to one "end of the shaft. 8;"-there is also fixed a pinion gea'r lOfth'at meshes -;with a drivingzgear 11 carried by a shaft journaled' in suitable bearings 12 carried by the upper surfaceof the base fraineyl. 5 This driv ng gear 11 is suitably connected with-ta source ofp'owerrso that motion may be transmitted through the piniongear 10 to theIshaft-S in order to revolve the latterfwithingthe beariois and 4 of the drawings.

ing 7 and thereby rotate the clutch members 9. In axial alinement with the bearing 7 at either side thereof are bearings 13, and journaled in these bearings 13 are shafts 14 co-aXial with each other and with the shaft 8. The inner ends of the shaft .14 have splined thereon clutch members 15 that cooperate respectively Withthe clutch members 9, so that the shafts 14 may be connected to and disconnected from the shaft '8 independently of each other. In the present instance each slidable clutch member 15 is connected with a yoke 16 carried by one end of a lever 17 that is pivoted between its ends, as at 18. to the lower end of the adjacent inclined portion 5 of 'the'beam 4 and these levers 17 are connected through the medium of rods 19, respectively, with the lower extremities of. clutch shifter levers 20 f-ulcrunied between their ends upon the respective beams 4. Thus, in the manipulation of the clutch shifter levers 20 the clutches may be engaged and disengaged, in order .to establish and break the driving connections between the shaft 8 and the shafts 14. I

The outer ends of the shafts 14 project beyond the respective ends of the base frame 1 and extend into troughs or receptacles 21, respectively, that are carried .by brackets 22 adjacent to the ends of the lease frame 1,

as clearly shown in Figure 1 of the draw ings. 'Each receptacle 21 is adapted to con tain a quantity of powder 'or othersubstance for grinding purposes in a manner which will presently appear.

In the present embodiment of my invention, the outer end of each shaft14 is circu-inferentially reduced in diameter and mounted iupon such end is a spherical grinding element 23 shown clearly in Figures 2 Each grinding element '23 is in the form of a sphere divided into hemispheres 2424. The central por- 'tions'of the hemispheres 24 that confront each other are formed with inwardly ex- :tending sleeves '25, and these sleeves 25 a'line axially with each other and fit upon the cir 'cumferentially reduced portion of the corresponding shaft 14 and are secured to the reduced portion of such shaft by a washer and set screw 26 that is threaded into the outer end of the shaft and cooperates with the shoulder formed between -the normal dia'm'eter of the shaft-and the reducedend portion thereof to effectively clamp the hemisphere in a spherical relation, as clearly shown in Figure 4,

These spheres are disposed respectively within the troughs 2'1 and rotated therein upon the rotation of the'shaft 14, as previously described.

In'accordance with my invention the outer of "each beam 4 is formed with a vertical bore 27, as clearly shown in Figure 2 of the drawings, and mounted within this bore 27 is a vertical rod 28. This rod 28 is anovable vertically within the bore 27 and may be held in the desired position by means of set "screws '29 that are threaded through the beam and engage the rod 28. The lower end of each .rod 28 is disposed above and in line with the diainetrical center of the corresponding grin-ding sphere and fastened to the lower end of each rod 28 is a multiple arm lens carrier support 30 which may be threearmed, as shown in Figure 6 of the drawings, or four-armed, as indicated by 30 in Figure 7 of the drawings. On each arm of the lens carrier support is a lens carrier In the present instance each lens carrier 31 comprises a casting" 32 that fits over the outer end of the corresponding supporting arm and is bolted or riveted thereto, as at The outer end of this casting is formed with an outwardly projecting lug'34 formed Wilfl l a transverse bore 35 and having the inner face thereof formed with radial ribs 36, as clearly shown in Figi-u'e 8 of the drawings. Placed in face to face contact with the ribbed surface of the lug 34 is a tug on a casting 38 and the face of the lug 37 that confronts the ribbed face'of the lug 34 is formed with corresponding ribs 39, clearly shown in Fig ure 9 of the drawings. This lug 37 is also provided with a bore 40 that alines with the bore 35 in the lug 34 and through "these alining bores is passed a set bolt 41 by means of which the lugs may be clamped or held firmly in the desired adjusted position.

The casting 38 that carries the lug 37 is in the form of a sleeve, as shown in Figure 9 of the drawings, and threaded on the upper end thereof is a cap 42 that is formed with an opening alining axially with the bore of the sleeve. Through the bore of the sleeve and the opening in the cap 42 is passed a rod 43 that is movable longitudinally within the sleeve-like casting 38 and is equipped above the cap with a cam actuator 44, by means of which the rod 43 may be elevated and lowered within'the-sleeve.

The rods 43 carried by the 'arms of the lens carrier support rotate from the spherical grinding element 23, clearly shown in Figure 2 of the drawings, and on the lower end of each rod 43 is a multiple-armed lens "support 45, the arms of which are-equipped "respectively with lens work holders 46 in which the lenses to be ground are placed. These lens work holders 46 are each ofsuch construction that the lenses to be ground or polished may be quickly clamped to therespect-ive arms and removed therefrom. The

lens carrying arms 45 on the lower end of From the foregoing. description, taken in connection with the accompanymg drawings, it will be seen that I have provided a lens grinding. and polishing machine bymeans of which a plurality of lenses may be ground or polished simultaneously,- and wherein by the use of spherical grinding elements the lenses may be properly treated and the grinding spheres likewise treated for grinding or polishing purposes.

While I have herein shown and described one preferred form of my invention by way of illustration, I wish it to be understood that I do not limit or confine myself to the precise details of construction herein shown and delineated, as modifications and variations may be made within the scope of the claims and without departing from the spirit of'my invention.

Having thus described the invention, what is claimed as new, is c 1. In a lens grinding and polishing machine a supporting frame, a beam projecting from the frame and having in its end a vertically extending opening, a bar extending throughsaid opening, means for adjustably supporting the bar in the opening, a lens carrier support on the lower end of the bar, a lens carrier including a pair of pivoted members one fixed to the lens carrier support and the other provided with a bore, a rod slidable through the bore, lens holders :at the end ofsaid rod, and. a spring associated withsaid rod for holding the lens in the work holders against a grinding element.

V 2. In a lens grinding and polishing ma- I chine, a supporting frame, a beam projecting from the frame and having in its end a vertically extending opening, a bar extending through said opening, means for adjustably supporting'the bar in the opening, a lens carrier support on the lower end of the bar, a lens carrier including a pair of pivoted members, one fixed to the lens carrier support and the other provided with a bore, a

rod slidable through the bore, lens holders,

at the end of said rod, a spring associated with said rod for holding the lens in the work holder against a grinding element, and a cam actuator on the rod engageable against the lens carrier through which the rod is slidable upon the grinding element and operable to withdraw the lens holders from the grinding elements. a y In testimony whereof I afiix my signature.

JOHN T. BRESNIN, 

